Citation: Jie-xin Yang, Wei-na He, Jun-ting Xu, Bin-yang Du, Zhi-qiang Fan. Influence of Different Inorganic Salts on Crystallization-driven Morphological Transformation of PCL-b-PEO Micelles in Aqueous Solutions[J]. Chinese Journal of Polymer Science, ;2014, 32(9): 1128-1138. doi: 10.1007/s10118-014-1512-z shu

Influence of Different Inorganic Salts on Crystallization-driven Morphological Transformation of PCL-b-PEO Micelles in Aqueous Solutions

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MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding author: Jun-ting Xu,
Received Date: 5 March 2014
Revised Date: 24 April 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21274130).

Different inorganic salts, including NaSCN, NaCl, MgCl2 and Na2SO4, were added into the aqueous solution containing poly(-caprolactone)-b-poly(ethylene oxide) (PCL-b-PEO) semicrystalline micelles. The effects of inorganic salt on the micellar size and morphology were investigated with TEM and DLS. It is found that addition of NaSCN leads to increase of the micellar size, but the micelles remain to be spherical. By contrast, the other three inorganic salts can induce sphere-to-cylinder or sphere-to-lamella transformations of the PCL-b-PEO semicrystalline micelles. The alteration rate of the micellar size with the time after addition of the inorganic salts decreases in the following order: Na2SO4 NaCl MgCl2 NaSCN. These results were interpreted in terms of the salting-out ability of the cations and anions. The anions SO42- and Cl- have a stronger salting-out ability, driving the morphological transformations of the micelles and leading to a rapid change in micellar size. By contrast, SCN- has a weaker salting-out ability. The cations Na+ and Mg2+ may associate with the PEO blocks, leading to a salting-out effect as well. However, the salting-out ability of cations is weaker than that of SO42- and Cl- anions, and the salting-out abilities of Na+ and Mg2+ are similar.
- Block copolymer,
- Crystallization,
- Inorganic salt,
- Micelle
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